Ventilator.



SATES PATENT OFFICE.

ERNEST B. FREEMAN, OF DEDHAM, MASSACHUSETTS, ASSISI-NOR TO B. F. STURTEVANT COMPANY, 0F BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

vnivrILATor..`

Application' filed Jul)r 6, 1909. Serial N0. 505,955`

To all whom it may concern:

Be it known that I, ERNEST B. FREEMAN, a citizen of the United States, residing at Dedham, inthe county of `Norfolk and State of Massachusetts, have invented certain nevi7 and useful Improvements in ventilators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as Will enable others skilled in the art to which it appertains to make and use the same. e

The invention relates to apparatus for Ventilating telephone booths.

It is desirable that telephone booths should be substantially noise-proof, so that the conversation of the occupant may be unintelligible outside the booth, and so that the occupant may not be disturbed by outside noises. For this reason these booths are usually provided with double Walls and doors separated by a dead air space. While this construction renders the booth substantially noise-proof, it also effectively cuts off all communication With the outside air, so that when the door of the booth is closed the interior quickly becomes uncomfortably hot and oppressive.

It is the object of the present .invention to provide for the ventilation of such booths Without rendering the conversation of the occupants intelligible outside the booth or admitting outside noises to disturb him.

To this end the invention contemplates providing a telephone booth With-ventilat-l ing air passages or openings constructed and arranged to change the velocity andpdirection of th'e air, and also providing means for causing a flow of air through the passages and the' booth .either by forcing air into or exhausting air yfrom the booth. By the change in the velocity and in the direction of the flow ofthe air passing through the ventilated openings or passages, the

form of telephone booths it is preferred,

Specification' of Letters Patent. Patented Apr. 25, `1911.

however, to provide 'the inner Wall with oneor more ventilators having restricted open-l ings for thepassage of the air, and to provide the outer Wall with one or more of such ventilatorsarranged out of line with the ventilator or ventilators in the inner wall, and it is also preferred to provide for the-circulation of air through the booth and ventilators by forcing air into the booth. The

ventilators are preferably provided with means for varying the area of the openings through which the air passes in accor ance Awith the rate at which the air isforced into or drawn from the booth to secure the requisite change in velocity, or to entirely close the openings in case the-booth is not being ventilated.

The various features of the'invention will each boothf isfprovided, preferably near its ,n

top, With a ventilating opening 6. A ventilator plate 7 is secured over the opening, and

this plate is provided with a series of holes 8 through Which the air space 5 communi cates With the outer air. The ventilator plate 7 is provided With xa slide 9 having openings therethrough corresponding to the openings 8, and this slide is retained by the; plate so that it may be adjusted to close the openings 8 or to vary their open area as desired. F or* the purpose of adjustment, the

slide is provided with a handle 10 projecting' through a slot formed in the plate 7.

The inner Wall 3 of thefbooth is provided, preferably nearthe floor of the booth, with a Ventilating opening 11. The ventilator plate 12, similar to the ventilator'plate 7 is -secured over this opening, and is provided Air is forced into the interior of the booth' l through a pipe 14, the inner end of which communicates with a diffuser 15, so bonstructed i'. i und distrbthm; the l'equ 1m1iai'rm. in the veloci'iy Ut@ the pe 115k of the, outgoing; all' may bc: Securedunder ing nir through *che 'pipes 141i ini@ ih@ interior Subg'p.; M311] ih@ Same const :tion may n of he vomiV :mm3 il am? 2 cm'xszqts o il Sma bg utilized in wird wm the booh by 70 'culy driven 'F n 16.; 'the @recharge pkw ex um ving or duw 1g" am' from the booth.

A (ampe: muy me zpes 11.1: Y, V xiv from the he booth in cm3@ L '.lwmv thfa presl 1 ..1 4 l tkm wif flew of L` i all will be so 80 A up or so 15 may be cnsed o prevent thY through thea@ siound Wm wipe M. it :mees ih@ 

